1. click on add media

2. upload files and insert into post

3. copy the url. example below´╝Ü

only copy this part

http://goldenwok716.com/wp-content/uploads/2014/07/menu.pdf

menu

paste it into the code above only replace from the http:// part to .pdf
example:

when you finished copy and paste

delete what is new to this post: expample

menu